I have read several articles, including one by Roy Gunther on this site, about shooting - or not shooting - old (pre-WWII) sxs guns. I know that most pre-1900 guns and many after that date are not proofed for smokeless. That is fine, I like black powder. What are the basic guidelines for determining safe loads and guns in this category? I am eying a couple of very nice old guns and the one I buy I would like to shoot light BP loads in Cowboy Action.I may have posted a similar question before, but have been distracted by moving, so I do lots of stuff on the fly and quickly forget. Thanks.